CA2211223C - Procede de pretraitement d'une pulpe destinee au blanchiment par du peroxyde - Google Patents
Procede de pretraitement d'une pulpe destinee au blanchiment par du peroxyde Download PDFInfo
- Publication number
- CA2211223C CA2211223C CA002211223A CA2211223A CA2211223C CA 2211223 C CA2211223 C CA 2211223C CA 002211223 A CA002211223 A CA 002211223A CA 2211223 A CA2211223 A CA 2211223A CA 2211223 C CA2211223 C CA 2211223C
- Authority
- CA
- Canada
- Prior art keywords
- pulp
- stage
- peroxide
- tower
- adt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 50
- 150000002978 peroxides Chemical class 0.000 title claims abstract description 44
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000011282 treatment Methods 0.000 claims abstract description 43
- 239000002253 acid Substances 0.000 claims abstract description 34
- 238000004061 bleaching Methods 0.000 claims abstract description 29
- 235000019398 chlorine dioxide Nutrition 0.000 claims abstract description 26
- 239000004155 Chlorine dioxide Substances 0.000 claims abstract description 25
- 239000000126 substance Substances 0.000 claims abstract description 25
- 230000020477 pH reduction Effects 0.000 claims abstract description 11
- 230000003247 decreasing effect Effects 0.000 claims abstract description 7
- 239000008139 complexing agent Substances 0.000 claims abstract description 6
- 230000001590 oxidative effect Effects 0.000 claims abstract description 4
- 238000010411 cooking Methods 0.000 claims description 27
- 229910052760 oxygen Inorganic materials 0.000 claims description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 18
- 239000001301 oxygen Substances 0.000 claims description 18
- 229910001385 heavy metal Inorganic materials 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 9
- 239000007844 bleaching agent Substances 0.000 claims description 8
- 229910052749 magnesium Inorganic materials 0.000 claims description 7
- 239000011777 magnesium Substances 0.000 claims description 7
- 239000000706 filtrate Substances 0.000 claims description 6
- 102000004190 Enzymes Human genes 0.000 claims description 5
- 108090000790 Enzymes Proteins 0.000 claims description 5
- 229910052791 calcium Inorganic materials 0.000 claims description 5
- 239000011575 calcium Substances 0.000 claims description 5
- BDAGIHXWWSANSR-UHFFFAOYSA-N Formic acid Chemical compound OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 4
- 239000001117 sulphuric acid Substances 0.000 claims description 4
- 235000011149 sulphuric acid Nutrition 0.000 claims description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 3
- 239000000460 chlorine Substances 0.000 claims description 3
- 229910052801 chlorine Inorganic materials 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims 3
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims 2
- 238000007664 blowing Methods 0.000 claims 1
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 claims 1
- 238000007599 discharging Methods 0.000 claims 1
- 230000009920 chelation Effects 0.000 abstract description 17
- 150000004965 peroxy acids Chemical class 0.000 abstract description 8
- FHHJDRFHHWUPDG-UHFFFAOYSA-N peroxysulfuric acid Chemical compound OOS(O)(=O)=O FHHJDRFHHWUPDG-UHFFFAOYSA-N 0.000 abstract description 3
- 238000012546 transfer Methods 0.000 abstract description 3
- 229940099041 chlorine dioxide Drugs 0.000 description 22
- 229910052751 metal Inorganic materials 0.000 description 15
- 239000002184 metal Substances 0.000 description 15
- 150000002739 metals Chemical class 0.000 description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 7
- 230000007423 decrease Effects 0.000 description 7
- 229940123150 Chelating agent Drugs 0.000 description 6
- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 description 6
- 239000002738 chelating agent Substances 0.000 description 6
- 238000010306 acid treatment Methods 0.000 description 5
- 230000002378 acidificating effect Effects 0.000 description 5
- 230000036961 partial effect Effects 0.000 description 5
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 4
- KFSLWBXXFJQRDL-UHFFFAOYSA-N Peracetic acid Chemical compound CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 description 4
- 150000007513 acids Chemical class 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000011121 hardwood Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 3
- -1 perhydroxyl ion Chemical class 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 239000011122 softwood Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 229910052774 Proactinium Inorganic materials 0.000 description 2
- 235000017168 chlorine Nutrition 0.000 description 2
- 229940060038 chlorine Drugs 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 238000009533 lab test Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 238000004537 pulping Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229960002163 hydrogen peroxide Drugs 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000002311 subsequent effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/001—Modification of pulp properties
- D21C9/007—Modification of pulp properties by mechanical or physical means
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/1005—Pretreatment of the pulp, e.g. degassing the pulp
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/1026—Other features in bleaching processes
- D21C9/1042—Use of chelating agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/0041—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for only one medium being tubes having parts touching each other or tubes assembled in panel form
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
- F28D7/106—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically consisting of two coaxial conduits or modules of two coaxial conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- Paper (AREA)
Abstract
La présente invention concerne un procédé pour prétraiter par acidification et chélation une pâte à papier destinée au blanchiment par un peroxyde. Plus particulièrement l'invention permet d'intensifier et en même temps de simplifier le prétraitement nécessaire lors d'un blanchiment par du peroxyde. Selon l'invention, la pâte est introduite dans une tour d'acidification (14, 112) où la pression est de 0 à 20 bar, de préférence de 1 à 10 bar et la température de 75 à 130 ·C, de préférence de 80 à 110 ·C. Le traitement de la pâte dans la tour d'acidification (14, 112) se fait à un pH de 2 à 6, de préférence de 3 à 4, pendant 20 à 240 minutes, ce qui permet de diminuer l'indice kappa de 1-9 unités et de préférence de 2-6 unités. La pâte est transférée de la tour d'acidification (14, 112) vers une tour (24) utilisée pour la seconde étape du traitement, par un agent complexant à un pH de 4 à 9, de préférence 5 à 6, ou par un agent acidifiant tel que le dioxyde de chlore, l'acide Caro, un peracide ou similaire. Finalement, la pâte est lavée et/ou pressée.
Applications Claiming Priority (11)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI950749A FI103817B1 (fi) | 1995-02-17 | 1995-02-17 | Menetelmä peroksidilla valkaistavan massan esikäsittelemiseksi |
| FI950749 | 1995-02-17 | ||
| SE9502087A SE516688E (sv) | 1995-02-17 | 1995-06-07 | Behandling av massa före peroxidblekning med syra och komplexbildare |
| SE9502087-1 | 1995-06-07 | ||
| FI953064 | 1995-06-20 | ||
| FI953064A FI953064A7 (fi) | 1995-06-20 | 1995-06-20 | Menetelmä ja laitteisto massan käsittelemiseksi |
| FI953343A FI103819B (fi) | 1995-02-17 | 1995-07-06 | Menetelmä peroksidilla valkaistavan massan esikäsittelemiseksi |
| FI953343 | 1995-07-06 | ||
| FI954407A FI954407A7 (fi) | 1995-06-20 | 1995-09-19 | Menetelmä ja laitteisto massan käsittelemiseksi |
| FI954407 | 1995-09-19 | ||
| PCT/FI1996/000090 WO1996025552A1 (fr) | 1995-02-17 | 1996-02-16 | Procede de pretraitement d'une pulpe destinee au blanchiment par du peroxyde |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2211223A1 CA2211223A1 (fr) | 1996-08-22 |
| CA2211223C true CA2211223C (fr) | 2002-04-30 |
Family
ID=27514651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002211223A Expired - Fee Related CA2211223C (fr) | 1995-02-17 | 1996-02-16 | Procede de pretraitement d'une pulpe destinee au blanchiment par du peroxyde |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6736934B1 (fr) |
| EP (1) | EP0858526A1 (fr) |
| CA (1) | CA2211223C (fr) |
| WO (1) | WO1996025552A1 (fr) |
Families Citing this family (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI105701B (fi) | 1995-10-20 | 2000-09-29 | Ahlstrom Machinery Oy | Menetelmä ja laitteisto massan käsittelemiseksi |
| US6306334B1 (en) | 1996-08-23 | 2001-10-23 | The Weyerhaeuser Company | Process for melt blowing continuous lyocell fibers |
| US6235392B1 (en) | 1996-08-23 | 2001-05-22 | Weyerhaeuser Company | Lyocell fibers and process for their preparation |
| US6221487B1 (en) | 1996-08-23 | 2001-04-24 | The Weyerhauser Company | Lyocell fibers having enhanced CV properties |
| US6210801B1 (en) | 1996-08-23 | 2001-04-03 | Weyerhaeuser Company | Lyocell fibers, and compositions for making same |
| US6605350B1 (en) | 1996-08-23 | 2003-08-12 | Weyerhaeuser Company | Sawdust alkaline pulp having low average degree of polymerization values and method of producing the same |
| US6331354B1 (en) | 1996-08-23 | 2001-12-18 | Weyerhaeuser Company | Alkaline pulp having low average degree of polymerization values and method of producing the same |
| EP0925401B1 (fr) * | 1996-09-11 | 2002-01-16 | SOLVAY INTEROX (Société Anonyme) | Procede de blanchiment de pate a papier |
| BE1010617A3 (fr) * | 1996-09-11 | 1998-11-03 | Solvay Interox | Procede de blanchiment de pate a papier. |
| BE1010678A3 (fr) * | 1996-10-11 | 1998-11-03 | Solvay Interox | Procede de delignification et de blanchiment de pate a papier chimique. |
| BE1010677A3 (fr) * | 1996-10-11 | 1998-11-03 | Solvay Interox | Procede de delignification et de blanchiment de pate a papier chimique. |
| BE1010679A3 (fr) * | 1996-10-11 | 1998-11-03 | Solvay Interox | Procede de delignification et de blanchiment de pate a papier chimique. |
| SE507742C2 (sv) * | 1996-11-08 | 1998-07-06 | Sunds Defibrator Ind Ab | Förblekningsbehandling av pappersmassa med klordioxid, alkali och komplexbildare utan mellanliggande tvättar |
| EP0863251A1 (fr) * | 1997-03-04 | 1998-09-09 | Oji Paper Co., Ltd. | Procédé pour la préparation de pâte à papier blanchie |
| US5919238A (en) * | 1998-03-04 | 1999-07-06 | Ford Global Technologies, Inc. | Method for aligning a vehicle suspension |
| BE1011784A3 (fr) * | 1998-03-10 | 2000-01-11 | Solvay | Procede de blanchiment de pate a papier. |
| BE1012675A6 (fr) * | 1999-05-11 | 2001-02-06 | Solvay | Procede de blanchiment de pate a papier. |
| US6685856B2 (en) | 1999-02-24 | 2004-02-03 | Weyerhaeuser Company | Use of thinnings and other low specific gravity wood for lyocell products method |
| US6686040B2 (en) | 1999-02-24 | 2004-02-03 | Weyerhaeuser Company | Use of thinnings and other low specific gravity wood for lyocell products |
| US6797113B2 (en) | 1999-02-24 | 2004-09-28 | Weyerhaeuser Company | Use of thinnings and other low specific gravity wood for lyocell pulps method |
| US6686039B2 (en) | 1999-02-24 | 2004-02-03 | Weyerhaeuser Company | Use of thinnings and other low specific gravity wood for lyocell pulps |
| US20050051288A1 (en) * | 2003-09-09 | 2005-03-10 | Caifang Yin | Extended retention and medium consistency pulp treatment |
| FI123102B (fi) * | 2006-03-31 | 2012-11-15 | Laennen Tutkimus Western Res Inc Oy | Kemiallisen massan valkaisumenetelmä |
| US8920603B2 (en) * | 2006-10-11 | 2014-12-30 | Akzo Nobel N.V. | Bleaching of pulp |
| US20080110584A1 (en) * | 2006-11-15 | 2008-05-15 | Caifang Yin | Bleaching process with at least one extraction stage |
| US8262856B2 (en) * | 2007-06-18 | 2012-09-11 | Andritz Inc. | Processes and systems for the bleaching of lignocellulosic pulps following cooking with soda and anthraquinone |
| KR20180061089A (ko) * | 2015-09-30 | 2018-06-07 | 이메리즈 미네랄즈 리미티드 | 수성 펄프를 표백하는 방법 및 이러한 방법에 사용하기 위한 조성물 |
| CN110258160A (zh) * | 2019-07-23 | 2019-09-20 | 广西大学 | 一种安全节能高效的高温二氧化氯纸浆漂白方法及漂白装置 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1062734A (en) | 1963-03-21 | 1967-03-22 | Mo Och Domsjoe Ab | Improvements in or relating to bleaching cellulose pulp |
| JPS5721591A (en) * | 1980-07-11 | 1982-02-04 | Mitsubishi Gas Chemical Co | Peroxide bleaching of wood pulp |
| FR2520397A1 (fr) * | 1982-01-28 | 1983-07-29 | Centre Tech Ind Papier | Procede pour le traitement de pates papetieres chimiques |
| FR2655668B1 (fr) | 1989-12-11 | 1995-06-09 | Du Pin Cellulose | Procede de blanchiment de pates cellulosiques chimiques. |
| DE69301285T2 (de) * | 1992-07-06 | 1996-08-22 | Solvay Interox | Verfahren zur Delignifizierung von chemischen Zellstoffen |
| DE69306974T3 (de) * | 1992-11-27 | 2004-01-08 | Eka Chemicals Ab | Verfahren zur deligrifizierung von lignocellulosehaltigem zellstoff |
| BE1006881A3 (fr) * | 1993-03-02 | 1995-01-17 | Solvay Interox | Procede pour la delignification d'une pate a papier chimique. |
| EP0622491B2 (fr) | 1993-04-20 | 2002-07-17 | Eka Chemicals AB | Procédé pour le blanchiment de pâte à papier contenant de la lignocellulose |
| SE501253C2 (sv) | 1993-06-08 | 1994-12-19 | Kvaerner Pulping Tech | Klorfri blekning av kemisk pappersmassa |
-
1996
- 1996-02-16 EP EP96902301A patent/EP0858526A1/fr not_active Withdrawn
- 1996-02-16 US US08/875,424 patent/US6736934B1/en not_active Expired - Fee Related
- 1996-02-16 WO PCT/FI1996/000090 patent/WO1996025552A1/fr not_active Ceased
- 1996-02-16 CA CA002211223A patent/CA2211223C/fr not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US6736934B1 (en) | 2004-05-18 |
| CA2211223A1 (fr) | 1996-08-22 |
| WO1996025552A1 (fr) | 1996-08-22 |
| EP0858526A1 (fr) | 1998-08-19 |
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